Do Fast Lenses Matter Anymore?

Started Feb 23, 2013 | Discussions thread
Lee Jay Forum Pro • Posts: 52,092
A stop is a stop....and more - much more!

Just because it's "only" one stop doesn't mean that stop doesn't matter.

Further, it's not just a stop.  It the ability to use a 2x teleconverter versus a 1.4x and still retain autofocus.  So, think of it like this:  70-280/4-5.6 versus 70-400/2.8-5.6.  That's a big difference to me.

It's 40% more diffraction-limited resolving power because of the 40% larger aperture.

And, it's a stop more control over depth of field, even when you aren't light-limited.

So, a stop is more than "just a stop".

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Lee Jay
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